package com.netty.demo.chat.server;


import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.util.concurrent.GlobalEventExecutor;

public class SimpleChatServerHandler extends SimpleChannelInboundHandler<String>{
	
	public static ChannelGroup channels = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);
	
	@Override
	public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
		Channel inComing = ctx.channel();
		
		channels.writeAndFlush("[SERVER]-"+ inComing.remoteAddress() + "加入 \n");
		
		channels.add(ctx.channel());
	}
	
	@Override
	public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
		Channel inComing = ctx.channel();
		channels.writeAndFlush("[SERVER]-" + inComing.remoteAddress() + "离开 \n" );
	}
	
	@Override
	protected void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {
		Channel inComing = ctx.channel();
		for (Channel channel : channels) {
			if(channel != inComing){
				channel.writeAndFlush("["+inComing.remoteAddress()+"]"+msg+"\n");
			}else{
				channel.writeAndFlush("[you]"+msg+"\n");
			}
		}
		
	}
	
	@Override
	public void channelActive(ChannelHandlerContext ctx) throws Exception {
		Channel inComing = ctx.channel();
		System.out.println("SimpleChatClient:"+inComing.remoteAddress()+"在线");
	}
	
	@Override
	public void channelInactive(ChannelHandlerContext ctx) throws Exception {
		Channel inComing = ctx.channel();
		System.out.println("SimpleChatClient:"+inComing.remoteAddress()+"掉线");
	}
	
	@Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) { 
        Channel incoming = ctx.channel();
        System.out.println("SimpleChatClient:"+incoming.remoteAddress()+"异常");
        // 当出现异常就关闭连接
        cause.printStackTrace();
        ctx.close();
    }

}
